I know this sound a "Muzak" or elevator music. Background music such as this use to be piped into elevators, stores, businesses like doctors and dental offices. Muzak was the premier supplier in te 60's.
My next door neighbor was a Muzak installer and I spent many hours with him as a helper. The equipment was installed in a hotel suite and I recall that walking across the floor and getting near the metal equipment created huge static charges from my fingers...
You've done a great job in recreating that familiar sound. Very nice.
Charlie